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HTML PHP
<td align="center"><input type="text" class="form-control" id="<?php echo $i;?>" name="r2<?php echo $i+1;?>" onblur="mvalidate2()" style="text-align: center; border: 1px solid #ccc;width: 46px;">
<label id="errora<?php echo $i;?>" style="font-size:13px; color:#cc0000;margin-left: 5px;"><div style = "font-size:13px; color:#cc0000;"></div></label></td>
//I get an error Uncaught TypeError: Cannot read property 'value' of null at mvalidate2
JAVASCRIPT
function mvalidate2(){
var count = <?php echo $count2;?>;
for(var i=0;i<count;i++){
var sr = document.getElementById(i).value;
var temp = 'errora';
var t = temp.concat(i);
if(sr<5){
document.getElementById(t).innerHTML=" ";
return true;
}
else{
document.getElementById(t).innerHTML=" Enter valid Rating out of 4 ";
return false;
}
}
}
You don't have to start ID by number in JavaScript
var sr = document.getElementById("inp"+i).value;<input type="text" class="form-control" id="inp<?php echo $i;?>" name="r2<?php echo $i+1;?>" onblur="mvalidate2()" style="text-align: center; border: 1px solid #ccc;width: 46px;">Our community is visited by hundreds of web development professionals every day. Ask your question and get a quick answer for free.
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PHP (from the English Hypertext Preprocessor - hypertext preprocessor) is a scripting programming language for developing web applications. Supported by most hosting providers, it is one of the most popular tools for creating dynamic websites.
The PHP scripting language has gained wide popularity due to its processing speed, simplicity, cross-platform, functionality and distribution of source codes under its own license.
https://www.php.net/
JavaScript is a multi-paradigm language that supports event-driven, functional, and mandatory (including object-oriented and prototype-based) programming types. Originally JavaScript was only used on the client side. JavaScript is now still used as a server-side programming language. To summarize, we can say that JavaScript is the language of the Internet.
https://www.javascript.com/
HTML (English "hyper text markup language" - hypertext markup language) is a special markup language that is used to create sites on the Internet.
Browsers understand html perfectly and can interpret it in an understandable way. In general, any page on the site is html-code, which the browser translates into a user-friendly form. By the way, the code of any page is available to everyone.
https://www.w3.org/html/
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